{{define "cha02/map_struct"}}
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    map_struct <br>
    {{.user}} <br>
    {{.user.Id}}
    {{.user.Age}}
    {{.user.Name}}
    {{.user.Addr}}
    </body>
    </html>
{{end}}